Apparatus for transforming, transferring and re-transforming of

Details Apparatus for transforming, transferring and re-transforming of Apparatus for transforming, transferring and re-transforming of

1980-06-10

1983-02-01

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

370 23, 179 1SA, H03K 3013, H03K 5156

Patent

active

043719732

ABSTRACT:
An apparatus for transmitting and receiving signals representing such as speech. The apparatus provides for transforming a uniformly sampled signal to a non-uniformly sampled signal in a transmitter, transferring the signal thus non-uniformly sampled to a receiver and re-transforming the transferred non-uniformly sampled signal to a uniformly sampled signal in the receiver. In the transmitter, both a wave analyzer and a time-frequency transformer are coupled between a delay chain and a logic unit. A switch also is provided for excluding certain samples in response to a control signal from the logic unit. The control signal contains information on frequency sectors comprising samples with signal amplitudes which are low in relation to samples in other sectors. In the receiver, two delay chains are coupled together in series and one of the delay chains is coupled to a multiplication circuit. The output of the multiplication circuit is coupled to an addition circuit providing the output of the apparatus. The logic signal is received by the receiver and is used to select the multiplication coefficients for the multiplication circuit. The signals re-transformed have better quality due to the elimination of quantization noise and a more exact transfer of the frequency content of the signal.

REFERENCES:
patent: 4140876 (1979-02-01), Gagnon
patent: 4271500 (1981-06-01), Fjallbrant

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